Hello. I started having palpitations around March 10 and difficulty in breathing at random times of the day. I went to see a Cardiologist and my chest xrays and ecgs, thyroid tests, turned out normal. Now, I noticed that my nose feels stuffy despite not having colds. My chest feels tight and congested and it feels like there's a phlegm clinging at the tip of my tonsil. I can't breathe deep and I feel I don't get enough oxygen. The difficulty in breathing stops me from doing my usual and is scary